WebSockets and realtime

12-month change compares the average of the last 4 weeks of downloads with the first 4 weeks of the 52-week series. Gzip size is for the whole package, as measured by Bundlephobia. "-" means the value has not been fetched.

• opentelemetry-instrumentation-socket.ioopen telemetry instrumentation for the `socket.io` package
• @veltdev/clientVelt is an SDK to add collaborative features to your product within minutes. Example: Comments like Figma, Frame.io, Google docs or sheets, Recording like Loom, Huddles like Slack and much more.
• @exodus/replayRecord/inspect/replay fetch and WebSocket sessions
• @venizia/ignis-helpersProduction-ready TypeScript utility library: pluggable logging (winston or pino behind one ILogger contract), Redis single/cluster/sentinel with pub/sub, BullMQ/MQTT/Kafka message queues, MinIO/Disk/Bun-S3 object storage, AES-256/RSA/ECDH cryptography, Sn
• mcp-excalidraw-serverExcalidraw toolkit for AI coding agents — agent skill, CLI, and MCP server with a live canvas
• @logux/serverBuild own Logux server
• vuexfireFirestore binding for Vuex
• @socket.io/gcp-pubsub-adapterThe Socket.IO adapter for Google Cloud pub/sub, allowing to broadcast events between several Socket.IO servers
• @taceo/oprf-clientWebSocket client for distributed threshold OPRF over a network of service nodes
• primus-roomsSimple rooms wrapper for Primus
• rxjs-websocketsrxjs 7 websockets library
• @neon/functionsRuntime helpers for Neon Functions: `waitUntil` for deferring async work past a response, `upgradeWebSocket` for serving WebSockets from a fetch handler or a Hono route, `attachDatabasePool` for node-postgres idle-client errors, and `parseTriggerDelivery`
• @socket.io/mongo-emitterThe Socket.IO MongoDB emitter, allowing to communicate with a group of Socket.IO servers from another Node.js process
• coinbase-proClient for the coinbase-pro API
• @ahoo-wang/fetcher-eventstreamServer-Sent Events (SSE) support for Fetcher HTTP client with native LLM streaming API support. Enables real-time data streaming and token-by-token LLM response handling.
• iterm2-nodeNode.js client library for the iTerm2 API, inspired by github.com/tmc/it2.
• iii-browser-sdkIII SDK for the browser — no OpenTelemetry, no Node.js dependencies
• @soketi/soketiJust another simple, fast, and resilient open-source WebSockets server.
• moscaMQTT broker as a module
• coinbase-apiNode.js SDK for Coinbase's Advanced Trade, App, Exchange, International, Prime & Commerce REST APIs and WebSockets, with TypeScript & strong end to end tests.
• @pear-protocol/symm-coreTypeScript SDK for Symm Engine API - trading positions, TP/SL orders, and real-time WebSocket streams
• ws-parserWebSocket stream parser
• @mmmbuto/nexuscrewFaithful browser tmux client — attach to live sessions over a real PTY, localhost-only, mobile-easy
• loro-adaptorsAdaptors that bridge the Loro protocol to `loro-crdt` documents, `flock` replicas, and the ephemeral store. Includes an end‑to‑end encrypted adaptor for %ELO.
• moleculer-ioAn API GateWay service for Moleculer using Socket.IO
• loro-websocketWebSocket client and SimpleServer for syncing CRDTs base on loro-protocol
• sdp-translatorA simple SDP interoperability layer for Unified Plan/Plan B
• @agent-link/serverAgentLink relay server
• @veltdev/sdk-stagingVelt is an SDK to add collaborative features to your product within minutes. Example: Comments like Figma, Frame.io, Google docs or sheets, Recording like Loom, Huddles like Slack and much more.
• @liveblocks/react-flowAn integration of React Flow to enable collaboration and realtime cursors with Liveblocks.
• socket.io-pull-streamPull Streams for socket.io
• somesThis is a collection of tools, independent of any other libraries
• @adonisjs/websocket-packetVerify,create adonis websocket packets
• stitchkitContract-first backend framework — one defineContract() into an HTTP API, MCP tools, AI-agent tools and a typed client. Bun and Node.
• qlobber-fsqShared file system queue. Supports pub-sub, work queues, wildcards, multi-process and distributed use.
• @ggui-ai/protocolggui protocol types — events, renders, WebSocket, MCP, LLM models
• storyboardEnd-to-end, hierarchical, real-time, colorful logs and stories
• ccxwsWebsocket client for 37 cryptocurrency exchanges
• snapreqCross-platform HTTP and WebSocket client with one API across Node, web, Expo and React Native
• loro-protocolCompact binary wire protocol for collaborative CRDTs (Loro/Yjs), with encoders/decoders and bytes utilities
• kugelaudioOfficial TypeScript/JavaScript SDK for KugelAudio TTS API
• @aptre/it-wsSimple async iterables for websocket client connections
• pull-wsSimple pull-streams for websocket client connections
• @dreamonkey/vue-signalrSignalR plugin for Vue 3
• kucoin-apiComplete & robust JavaScript SDK for Kucoin's REST APIs and WebSockets, with TypeScript & strong end to end tests.
• rest-hooksAsynchronous data framework for React
• storyboard-coreEnd-to-end, hierarchical, real-time, colorful logs and stories
• @jitsi/sdp-interopA simple SDP interoperability layer for Unified Plan/Plan B
• websocket-json-streamExpose WebSockets with JSON as an object stream
• @convergence/convergenceConvergence JavaScript Client

• ws vs sockjs
• ws vs sockjs-client
• @copilotkit/aimock vs mock-socket
• partysocket vs reconnecting-websocket